do_favicon()

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Performance profile

How much work a call to do_favicon() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Moderate

Reads stored settings via get_option(), cached per request but not free on a cold cache.

Scaling

Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions

16

Executed per call on PHP 8.5. The body compiles to 16.

Plugin surface

1 hook

Third-party callbacks on 'do_faviconico' run inside this call, and their cost is not bounded by anything here.

Called by

0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

• hookthird-party callbacksdo_action()called directly
• optionoption read or writeget_option()one call below do_favicon()

Further down the call graph this can also reach cache, serialize, query and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 1 distinct outcome

One number would be a lie: the work depends on which branch runs. These are every distinct cost do_favicon() can have, taken from its control-flow graph on PHP 8.5.

Hooks and filters fired · 1

One hook fires while do_favicon() runs, in this order:

1. 1
   do_action( do_faviconico )actionline 1748 (+6 into the body)

   Fires when serving the favicon.ico file.

Uses · 4

• do_action()Calls the callback functions that have been added to an action hook.
• wp_redirect()Redirects to another page.
• get_site_icon_url()Returns the Site Icon URL.
• includes_url()Retrieves the URL to the includes directory.

Source code

View on Trac ↗View on GitHub ↗

1742function do_favicon() {1743	/**1744	 * Fires when serving the favicon.ico file.1745	 *1746	 * @since 5.4.01747	 */1748	do_action( 'do_faviconico' );1749 1750	wp_redirect( get_site_icon_url( 32, includes_url( 'images/w-logo-blue-white-bg.png' ) ) );1751	exit;1752}

Changelog

Introduced in 5.4.0. One change between 6.7.7 and 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.0.4 tag, from src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

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